Here's a link to a post I made a long time ago with links to Google Earth showing the location of the lakes and the camp site. View in 3D to see there was a large hill between the camp and the lakes.
CA - Stacy Arras, 14, Yosemite National Park, 17 Jul 1981
I also noticed Tenaya Lake and Tenaya Creek and Canyon are just beyond the Sunrise Lakes. Here's a photo of Tenaya Canyon
So what's the speculation about Stacy's fate at the other web sites?
I only recall reading one several years ago that proposed these missing persons in national parks had been abducted by aliens from other planets. Is that still the most popular theory?